MQTT connfail fix #3477
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MQTT connfail fix #3477
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devbranch rather than for thereleasebranch.docs/*.Noticed that cb_connect_fail_ref was not properly called sometimes, after wifi was reconnected (for example, explicit clearconfig + config). Seems DNS is resolved fine but the espconn returned -4. Since return value was ignored, the failure callback was never trigged, and LUA code could not see react properly (i.e. re-trigger connect attempt in my case)